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Originally Posted by sector95
Given the age and mileage of your truck I would definitely replace the EGR valve. While the diaphragm may move up and down, the pintle or valve portion of the EGR unit is probably erroded allowing exhaust gas to leak by at idle (when it shouldn't and causing a rough idle) and allowing too much exhaust gas into the intake stream when it does open (causing a loss of power and poor running). Yeah, you can run it without the EGR, but you'll find the engine will have a higher probability of engine knock...especially under load or high acceleration. The EGR tends to slow the combustion process by introducing inert (non-explosive) exhaust gas and thus reducing the probability of knock using 87 octane no lead.
Mike
98Sierra
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I was thinking because it was holding when I blew through it , it's still good.
But , I guess I could just change it out.
I was thinking the EGR being unplugged and the engine smoothing out would be a indicator of something else.
I understand the excess exhaust into the intake would bog it down.....heck I'm just being gunshy at this point , and trying to think this one out.
Thanks for the input.